Activity of linezolid and tedizolid against clinical isolates of methicillin-resistant and methicillin and linezolid resistant Staphylococcus aureus: an in vitro comparison.

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Title:	Activity of linezolid and tedizolid against clinical isolates of methicillin-resistant and methicillin and linezolid resistant Staphylococcus aureus: an in vitro comparison.
Alternate Title:	Actividad comparativa in vitro entre linezolid y tedizolid frente a aislados clínicos de Staphylococcus aureus resistentes a meticilina y aislados resistentes también a linezolid.
Authors:	Peñuelas, Marina¹, Javier Candel, Francisco¹ fj.candel@gmail.com, Lejarraga, Clara¹, López-González, Laura¹, Manuel Viñuela-Prieto, Jose¹, de Mendoza, Diego López²
Source:	Revista Española de Quimioterapia. oct2016, Vol. 29 Issue 5, p1-4. 4p.
Subjects:	METHICILLIN-resistant staphylococcus aureus treatment, LINEZOLID, DISEASE prevalence, DRUG resistance in bacteria, NOSOCOMIAL infections, THERAPEUTICS
Geographic Terms:	SPAIN
Abstract (English):	Introduction. The prevalence of methicillin-resistant Staphylococcus aureus (MRSA) in Spain is approximately 20-30%. However, resistance to linezolid is rare, and the main reports are from nosocomial outbreaks. The objective of the present study was to compare the in vitro susceptibility of linezolid with that of tedizolid against MRSA isolates and methicillin- and linezolid-resistant isolates (MLRSA) mediated by the cfr gene. Material and methods. The in vitro susceptibility of linezolid and tedizolid was determined using the E-test with 18 MRSA strains and 18 cfr-mediated MLRSA strains obtained from clinical isolates in the microbiology service of a tertiary university hospital. Results. All MRSA strains were susceptible to both antibiotics. Analysis of the MRSA isolates revealed that the MIC50 and MIC90 of linezolid were 1.5 and 2 mg/L, respectively; those of tedizolid were 0.25 and 0.4 mg/L. The MIC50 and MIC90 of tedizolid remained at 0.75 and 1 mg/L against the MLRSA strains (MIC90 = 8 mg/L). Conclusions. Both for MRSA and for MLRSA, the MICs obtained for tedizolid were at least 2 dilutions lower than those of linezolid, thus demonstrating between 2 and 4 times greater activity in vitro than linezolid. [ABSTRACT FROM AUTHOR]
Abstract (Spanish):	Introducción. La prevalencia de Staphylococcus aureus resistente a la meticilina (SARM) se sitúa en España en torno al 20 y el 30%. Sin embargo, la resistencia a linezolid se reporta de forma excepcional, salvo en algunos brotes nosocomiales. El objetivo de nuestro estudio fue realizar un análisis comparativo de la sensibilidad in vitro de linezolid y tedizolid frente a aislados de SARM, así como frente a otros también resistentes a linezolid (SARLM) mediados por el gen cfr. Material y métodos. Se determinó la sensibilidad in vitro a linezolid y tedizolid mediante la técnica de E-test a 18 cepas SARM y a otras 18 que además presentaban resistencia a linezolid (SARLM) mediadas por el gen cfr, procedentes de aislados clínicos en el Servicio de Microbiología de un Hospital terciario Universitario. Resultados. Todas las cepas de SARM fueron sensibles a ambos antibioticos. Analizando los aislados clinicos de SARM, las CMI50-CMI90 de linezolid fueron 1,5 y 2 mg/L respectivamente y en el caso de tedizolid de 0,25 y 0,4 mg/L. Frente a las cepas de SARLM (CMI90 . 8 mg/L) las CMI50-CMI90 de tedizolid se mantuvieron en 0,75 y 1 mg/L.. Conclusiones. Tanto en el caso de las SARM como en el de las SARLM, las CMI obtenidas con tedizolid resultaron ser de al menos dos diluciones más bajas, demostrando entre 2 y 4 veces mayor actividad in vitro que linezolid. [ABSTRACT FROM AUTHOR]
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Database:	MedicLatina

Description
Abstract:	Introduction. The prevalence of methicillin-resistant Staphylococcus aureus (MRSA) in Spain is approximately 20-30%. However, resistance to linezolid is rare, and the main reports are from nosocomial outbreaks. The objective of the present study was to compare the in vitro susceptibility of linezolid with that of tedizolid against MRSA isolates and methicillin- and linezolid-resistant isolates (MLRSA) mediated by the cfr gene. Material and methods. The in vitro susceptibility of linezolid and tedizolid was determined using the E-test with 18 MRSA strains and 18 cfr-mediated MLRSA strains obtained from clinical isolates in the microbiology service of a tertiary university hospital. Results. All MRSA strains were susceptible to both antibiotics. Analysis of the MRSA isolates revealed that the MIC50 and MIC90 of linezolid were 1.5 and 2 mg/L, respectively; those of tedizolid were 0.25 and 0.4 mg/L. The MIC50 and MIC90 of tedizolid remained at 0.75 and 1 mg/L against the MLRSA strains (MIC90 = 8 mg/L). Conclusions. Both for MRSA and for MLRSA, the MICs obtained for tedizolid were at least 2 dilutions lower than those of linezolid, thus demonstrating between 2 and 4 times greater activity in vitro than linezolid. [ABSTRACT FROM AUTHOR]
ISSN:	02143429